.app  {
    height: 100vw;
    display: flex;
    flex-direction: column;
}
.app-header {
    height: 60px;
    padding: 0 20px;
    border-bottom: 1px solid #e5e5e5;
}
.app-body {
    flex: 1;
    display: flex;
}
.logo {
    width: 120px;
    height: 60px;
    line-height: 60px;
    font-size: 20px;
    font-weight: bold;
}

.app-side {
    width: 230px;
    border-right: 1px solid #e5e5e5;
}
.app-content {
    flex: 1;
}
.app-content-inner {
    padding: 20px;
}
.menu-item {
    display: block;
    line-height: 40px;
    padding-left: 20px;
    text-decoration: none;
}